And if I may take up an old discussion, with reference to the posts by Mike Cross (yes, I'm aware you're only the messenger) regarding where and how to get the data, etc., I have a couple thoughts:
* Why can't ICAO (or even individual aviation authorities) come up with a system for the data to be distributed electronically, in machine readable form, directly from the national aviation authorities to the end user (to be crude, think an XML-based web service)? Is there any initiative at all in this respect, which I would have thought a rather obvious move?
* As far as certified data providers go, why would the provider, rather than the originator of the data, be in need of certification? Can't quite understand that one without my cynic hat on.